EGR cooler and engine system

Abstract

The invention relates to the technical field of engines, in particular to an EGR cooler and an engine system.The EGR cooler comprises a cooler shell, the cooler shell is provided with a through hollow cavity, and an air inlet, an air outlet, a water inlet and a water outlet are formed in the cooler shell; at least one group of Tesla valves are arranged in the hollow cavity along the extension direction of the cooler shell, the Tesla valves are provided with gas flow channels, the gas flow channels are communicated with the gas inlet and the gas outlet, cooling water flow channels are formed between the Tesla valves and the cooler shell, and the cooling water flow channels are communicated with the gas inlet and the gas outlet. The cooling water flow channel is communicated with the water inlet and the water outlet; and the cooling water circulation assembly is communicated with the water inlet and the water outlet in series. According to the EGR cooler, the integration degree of the EGR cooler can be improved, occupied space is reduced, and therefore arrangement is facilitated; and meanwhile, the waste gas cooling effect can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an EGR cooler and an engine system. Background Art

[0002] EGR (Exhaust Gas Recirculation) is a method of reducing nitrogen oxide emissions in the engine, and is mainly used in situations that meet high emission standards. The working principle of the EGR cooler is that when the engine is working, a part of the exhaust gas in the exhaust manifold is cooled by the EGR cooler and then sent back to the engine's intake manifold. Since the exhaust gas after combustion contains a large amount of carbon dioxide (about 5%, while the content of carbon dioxide in fresh air is almost negligible), after the exhaust gas cooled by the EGR cooler is pressed into the intake manifold, the concentration of oxygen in the intake air decreases, which will directly slow down the combustion speed, thereby reducing the peak temperature of combustion and reducing the generation of nitrogen oxides; in addition, since carbon dioxide has a larger specific heat capacity, after carbon dioxide enters the combustion chamber, the peak temperature of the mixed gas is lower when absorbing the same amount of heat, which can also reduce the generation of nitrogen oxides.

[0003] In the prior art, since the EGR cooler is directly connected to the exhaust manifold, there is a certain problem of exhaust gas backflow. In order to solve this problem, a one-way valve is usually connected in series upstream of the EGR cooler. However, this method will result in a larger structure of the entire EGR cooler, occupying a large space and being inconvenient to arrange. Moreover, the cooling effect of the EGR cooler on the exhaust gas is average.

[0004] Therefore, an EGR cooler and an engine system are needed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an EGR cooler and an engine system, which can improve the integration of the EGR cooler, reduce the space occupied, and thus facilitate the layout; at the same time, can ensure the cooling effect of the exhaust gas.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] EGR cooler, including:

[0008] A cooler shell, wherein the cooler shell has a through hollow cavity and is provided with an air inlet, an air outlet, a water inlet and a water outlet;

[0009] Tesla valves, at least one group of Tesla valves is arranged in the hollow cavity along the extension direction of the cooler shell, the Tesla valve has a gas flow channel, the gas flow channel is connected to the air inlet and the air outlet, a cooling water flow channel is formed between the Tesla valve and the cooler shell, and the cooling water flow channel is connected to the water inlet and the water outlet;

[0010] A cooling water circulation component is connected in series with the water inlet and the water outlet.

[0011] In some embodiments, a first reinforcement column is provided between adjacent Tesla valves, one end of the first reinforcement column is connected to one of the adjacent Tesla valves, and the other end of the first reinforcement column is connected to another adjacent Tesla valve.

[0012] In some embodiments, a plurality of the first reinforcement columns are spaced apart between adjacent Tesla valves along an extension direction of the cooler housing.

[0013] In some embodiments, a second reinforcement column is provided between the Tesla valve and the cooler housing, one end of the second reinforcement column is connected to the Tesla valve, and the other end of the second reinforcement column is connected to the inner wall of the cooler housing.

[0014] In some embodiments, a plurality of second reinforcement columns are spaced apart between the Tesla valve and the cooler shell along an extension direction of the cooler shell.

[0015] In some embodiments, the cooling water circulation component includes a water pump and a cooling water pipeline, the cooling water pipeline is connected to the water inlet and the water outlet, and the water pump is arranged on the cooling water pipeline.

[0016] In some embodiments, a controller and a temperature sensor are further included. The temperature sensor is used to collect the gas temperature of the gas outlet. The temperature sensor is electrically connected to the controller, and the controller is electrically connected to the water pump.

[0017] In some embodiments, a first partition and a second partition are provided at both ends of the Tesla valve, the first partition is sealed and fixedly provided at the air inlet, and the second partition is sealed and fixedly provided at the air outlet.

[0018] In some embodiments, a water inlet pipe and a water outlet pipe connected to the cooling water flow channel are provided on the cooler shell, the water inlet pipe is located at the water inlet, and the water outlet pipe is located at the water outlet.

[0019] An engine system comprises an engine and the EGR cooler as described above, wherein an air inlet of the EGR cooler is communicated with an exhaust manifold of the engine, and an air outlet of the EGR cooler is communicated with an air intake manifold of the engine.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides an EGR cooler, wherein the cooler shell has a through hollow cavity, and the cooler shell is provided with an air inlet, an air outlet, a water inlet and a water outlet. The Tesla valve is arranged in the hollow cavity along the extension direction of the cooler shell, and the Tesla valve has a gas flow channel, which is connected with the air inlet and the air outlet. A cooling water flow channel is formed between the Tesla valve and the cooler shell, and the cooling water flow channel is connected with the water inlet and the water outlet. The cooling water circulation component is connected in series with the water inlet and the water outlet. By arranging the Tesla valve in the cooler shell, the Tesla valve has the characteristic of unidirectional conduction, which can make the exhaust gas discharged by the engine unidirectionally circulate and avoid the phenomenon of backflow. Since the Tesla valve is integrated in the cooler shell and plays the role of unidirectional conduction at the same time, it can improve the integration of the EGR cooler and reduce the space occupation, so that it is convenient to arrange it in a narrow engine installation space. Since the cooling water flow channel is located between the Tesla valve and the cooler housing, the cooling water circulation component can discharge the cooling water into the cooling water flow channel through the water inlet, and the cooling water can quickly exchange heat with the Tesla valve, thereby ensuring the cooling effect on the exhaust gas.

[0022] An engine system provided by the present invention includes an engine and the EGR cooler as described above, which can improve the integration of the EGR cooler and reduce the space occupied, thereby facilitating the layout; at the same time, it can ensure the cooling effect of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 is a schematic diagram of an EGR cooler of the present invention;

[0025] Figure 2 is a cross-sectional view of an EGR cooler of the present invention;

[0026] Figure 3 is a schematic diagram of a Tesla valve in an EGR cooler of the present invention;

[0027] Figure 4It is a schematic diagram of an engine system of the present invention.

[0028] In the figure:

[0029] 1. Engine; 2. Supercharger turbine; 3. Supercharger compressor; 4. EGR cooler; 41. Water pump; 42. Temperature sensor; 43. Controller; 44. Cooler housing; 441. Water inlet pipe; 442. Water outlet pipe; 443. Air inlet; 444. Air outlet; 445. Water inlet; 45. Tesla valve; 451. First reinforcement column; 452. Second reinforcement column; 453. Gas flow channel; 46. Cooling water flow channel; 47. First partition; 48. Second partition. DETAILED DESCRIPTION

[0030] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0031] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0032] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0033] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0034] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that the directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0035] When designing and manufacturing the EGR cooler, in order to improve the integration of the EGR cooler and reduce the space occupied, it is convenient for layout and at the same time ensure the cooling effect of the exhaust gas. Figure 1-Figure 4 As shown, the present invention provides an EGR cooler. The EGR cooler 4 includes a cooler housing 44, a Tesla valve 45 and a cooling water circulation component.

[0036] The cooler shell 44 has a through hollow cavity, and is provided with an air inlet 443, an air outlet 444, a water inlet 445 and a water outlet. At least one set of Tesla valves 45 is arranged in the hollow cavity along the extension direction of the cooler shell 44, and the Tesla valve 45 has a gas flow channel 453, which is connected to the air inlet 443 and the air outlet 444. A cooling water flow channel 46 is formed between the Tesla valve 45 and the cooler shell 44, and the cooling water flow channel 46 is connected to the water inlet 445 and the water outlet. The cooling water circulation component is connected in series with the water inlet 445 and the water outlet.

[0037] By arranging the Tesla valve 45 in the cooler housing 44, the Tesla valve 45 has a one-way conduction characteristic, which can make the exhaust gas discharged from the engine 1 flow in one direction to avoid the phenomenon of backflow. Since the Tesla valve 45 is integrated in the cooler housing 44 and plays a one-way conduction role, it can improve the integration of the EGR cooler 4 and reduce the space occupation, so that it is convenient to arrange it in the narrow installation space of the engine 1. Since the cooling water flow channel 46 is located between the Tesla valve 45 and the cooler housing 44, the cooling water circulation component can discharge the cooling water into the cooling water flow channel 46 through the water inlet 445, and the cooling water can quickly exchange heat with the Tesla valve 45, thereby ensuring the cooling effect of the exhaust gas.

[0038] During the manufacturing process of Tesla valve 45, metal sheets are extruded to form half of the structure of Tesla valve 45, and then the two halves of the structure are welded together to form a unit of Tesla valve 45, and multiple units are welded in series to form the entire Tesla valve 45.

[0039] In some embodiments, a first reinforcement column 451 is provided between adjacent Tesla valves 45, one end of the first reinforcement column 451 is connected to one of the adjacent Tesla valves 45, and the other end of the first reinforcement column 451 is connected to another adjacent Tesla valve 45. Specifically, the first reinforcement column 451 is welded to the shells of two adjacent Tesla valves 45. By providing the first reinforcement column 451, the connection between adjacent Tesla valves 45 can be strengthened, thereby improving the connection strength between adjacent Tesla valves 45, reducing the vibration of the Tesla valve 45 caused by the flow of exhaust gas from the engine 1, and ensuring the stability and reliability of the Tesla valve 45.

[0040] In some embodiments, a plurality of first reinforcement columns 451 are disposed between adjacent Tesla valves 45 along the extension direction of the cooler housing 44. Through the above arrangement, the connection strength between adjacent Tesla valves 45 can be further improved, thereby ensuring the stability and reliability of the Tesla valves 45.

[0041] In some embodiments, a second reinforcing column 452 is provided between the Tesla valve 45 and the cooler housing 44, one end of the second reinforcing column 452 is connected to the Tesla valve 45, and the other end of the second reinforcing column 452 is connected to the inner wall of the cooler housing 44. Specifically, the second reinforcing column 452 is welded to the Tesla valve 45 and the cooler housing 44. By providing the second reinforcing column 452, the connection between the Tesla valve 45 and the cooler housing 44 can be strengthened, thereby improving the connection strength of the Tesla valve 45, reducing the vibration of the Tesla valve 45 caused by the exhaust gas flow of the engine 1, and ensuring the stability and reliability of the Tesla valve 45.

[0042] In some embodiments, a plurality of second reinforcement columns 452 are arranged between the Tesla valve 45 and the cooler housing 44 along the extension direction of the cooler housing 44. Through the above arrangement, the vibration of the Tesla valve 45 caused by the exhaust gas flow of the engine 1 can be further reduced, and the stability and reliability of the Tesla valve 45 can be ensured.

[0043] In some embodiments, the cooling water circulation assembly includes a water pump 41 and a cooling water pipeline, the cooling water pipeline is connected to the water inlet 445 and the water outlet, and the water pump 41 is arranged on the cooling water pipeline. The cooling water is driven by the water pump 41 to circulate in the cooling water pipeline. Specifically, the cooling water enters the cooling water flow channel 46 from the water inlet 445 of the cooler housing 44 under the drive of the water pump 41, and performs heat exchange with the exhaust gas in the gas flow channel 453 of the Tesla valve 45. Since the Tesla valve 45 is made of metal material, it has good thermal conductivity and can ensure sufficient heat exchange between the cooling water and the exhaust gas. Then the cooling water flows out from the water outlet, and the cooling water is circulated by the drive of the water pump 41. The cooling water pipeline can be connected to the cooling water channel of the cylinder head of the engine 1, or it can be arranged separately, and no excessive restrictions are made here.

[0044] In some embodiments, the EGR cooler 4 also includes a controller 43 and a temperature sensor 42. The temperature sensor 42 is used to collect the gas temperature of the gas outlet 444. The temperature sensor 42 is electrically connected to the controller 43, and the controller 43 is electrically connected to the water pump 41. The gas temperature of the gas outlet 444 is collected in real time by the temperature sensor 42, and the data is transmitted to the controller 43. The controller 43 determines whether the gas temperature meets the requirements and controls the output power of the water pump 41, thereby adjusting the temperature of the recovered exhaust gas. In this embodiment, the temperature sensor 42 installed on the EGR cooler 4 collects temperature data, determines the gas outlet temperature of the EGR cooler 4, compares the target EGR gas outlet temperature with the actual EGR gas outlet temperature, and determines whether adjustment is required. If the difference between the two is less than the set critical value, no adjustment is required; if the difference between the two is greater than the set critical value, the controller 43 controls the water pump 41 to adjust the flow rate, so that the EGR outlet gas temperature changes until it meets the requirements.

[0045] In some embodiments, a first baffle 47 and a second baffle 48 are provided at both ends of the Tesla valve 45. The first baffle 47 is sealed and fixedly provided at the air inlet 443, and the second baffle 48 is sealed and fixedly provided at the air outlet 444. By providing the first baffle 47 and the second baffle 48, the cooling water flow channel 46 is separated from the air inlet 443 and the air outlet 444, thereby ensuring that the cooling water flow channel 46 and the gas flow channel 453 are not connected to each other.

[0046] In some embodiments, the cooler housing 44 is provided with an inlet pipe 441 and an outlet pipe 442 connected to the cooling water flow channel 46, the inlet pipe 441 is located at the water inlet 445, and the outlet pipe 442 is located at the water outlet. The inlet pipe 441 and the outlet pipe 442 are provided to facilitate the subsequent installation of the cooling water pipeline.

[0047] This embodiment also provides an engine system, including an engine 1 and the above-mentioned EGR cooler 4, wherein the air inlet 443 of the EGR cooler 4 is connected to the exhaust manifold of the engine 1, and the air outlet 444 of the EGR cooler 4 is connected to the intake manifold of the engine 1. Specifically, the engine system includes the engine 1, the controller 43, the supercharger turbine 2, the supercharger compressor 3 and the EGR cooler 4. The supercharger turbine 2 and the supercharger compressor 3 are arranged on the engine 1, the supercharger turbine 2 is connected to the exhaust pipeline of the engine 1, and part of the exhaust gas of the engine 1 enters the supercharger turbine 2 and is discharged from the exhaust end; the supercharger compressor 3 is connected to the intake end pipeline of the engine 1, and the fresh air enters the engine 1 after being pressurized by the supercharger compressor 3. The EGR cooler 4 is connected to the exhaust pipeline of the engine 1, and part of the exhaust gas of the engine 1 enters the EGR cooler 4 and re-enters the intake passage of the engine 1 after being cooled. By adopting the EGR cooler 4 as described above, the integration of the EGR cooler 4 can be improved, and the space occupied can be reduced, thereby facilitating the layout; at the same time, the cooling effect on the exhaust gas can be ensured.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. EGR cooler, characterized in that: include: A cooler shell (44), the cooler shell (44) having a through hollow cavity, and the cooler shell (44) is provided with an air inlet (443), an air outlet (444), a water inlet (445) and a water outlet; A Tesla valve (45), at least one group of the Tesla valves (45) is arranged in the hollow cavity along the extension direction of the cooler shell (44), the Tesla valve (45) has a gas flow channel (453), the gas flow channel (453) is communicated with the air inlet (443) and the air outlet (444), a cooling water flow channel (46) is formed between the Tesla valve (45) and the cooler shell (44), and the cooling water flow channel (46) is communicated with the water inlet (445) and the water outlet; A cooling water circulation component is connected in series with the water inlet (445) and the water outlet.

2. The EGR cooler according to claim 1, characterized in that: A first reinforcing column (451) is arranged between adjacent Tesla valves (45), one end of the first reinforcing column (451) is connected to one of the adjacent Tesla valves (45), and the other end of the first reinforcing column (451) is connected to another adjacent Tesla valve (45).

3. The EGR cooler according to claim 2, characterized in that: A plurality of first reinforcement columns (451) are arranged at intervals between adjacent Tesla valves (45) along the extension direction of the cooler housing (44).

4. The EGR cooler according to claim 1, characterized in that: A second reinforcement column (452) is provided between the Tesla valve (45) and the cooler housing (44), one end of the second reinforcement column (452) is connected to the Tesla valve (45), and the other end of the second reinforcement column (452) is connected to the inner wall of the cooler housing (44).

5. The EGR cooler according to claim 4, characterized in that: A plurality of second reinforcement columns (452) are arranged at intervals between the Tesla valve (45) and the cooler housing (44) along the extension direction of the cooler housing (44).

6. The EGR cooler according to claim 1, characterized in that: The cooling water circulation component comprises a water pump (41) and a cooling water pipeline, the cooling water pipeline is in communication with the water inlet (445) and the water outlet, and the water pump (41) is arranged on the cooling water pipeline.

7. The EGR cooler according to claim 6, characterized in that: It also includes a controller (43) and a temperature sensor (42), wherein the temperature sensor (42) is used to collect the gas temperature of the gas outlet (444), the temperature sensor (42) is electrically connected to the controller (43), and the controller (43) is electrically connected to the water pump (41).

8. The EGR cooler according to claim 1, characterized in that: A first baffle (47) and a second baffle (48) are provided at both ends of the Tesla valve (45); the first baffle (47) is sealed and fixedly arranged at the air inlet (443); and the second baffle (48) is sealed and fixedly arranged at the air outlet (444).

9. The EGR cooler according to claim 1, characterized in that: The cooler shell (44) is provided with a water inlet pipe (441) and a water outlet pipe (442) which are in communication with the cooling water flow channel (46); the water inlet pipe (441) is located at the water inlet (445), and the water outlet pipe (442) is located at the water outlet.

10. An engine system, characterized in that It comprises an engine (1) and an EGR cooler as claimed in any one of claims 1 to 9, wherein an air inlet (443) of the EGR cooler is connected to an exhaust manifold of the engine (1), and an air outlet (444) of the EGR cooler is connected to an air inlet manifold of the engine (1).

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